[PATCH v4 58/59] sysfs(2): fs_index() argument is _not_ a pathname

Al Viro
2026-01-08T07:37:00Z

... it's a filesystem type name.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/filesystems.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/fs/filesystems.c b/fs/filesystems.c
index 95e5256821a5..0c7d2b7ac26c 100644
--- a/fs/filesystems.c
+++ b/fs/filesystems.c
@@ -132,24 +132,21 @@ EXPORT_SYMBOL(unregister_filesystem);
static int fs_index(const char __user * __name)
{
struct file_system_type * tmp;
- struct filename *name;
+ char *name __free(kfree) = strndup_user(__name, PATH_MAX);
int err, index;

- name = getname(__name);
- err = PTR_ERR(name);
if (IS_ERR(name))
- return err;
+ return PTR_ERR(name);

err = -EINVAL;
read_lock(&file_systems_lock);
for (tmp=file_systems, index=0 ; tmp ; tmp=tmp->next, index++) {
- if (strcmp(tmp->name, name->name) == 0) {
+ if (strcmp(tmp->name, name) == 0) {
err = index;
break;
}
}
read_unlock(&file_systems_lock);
- putname(name);
return err;
}

--
2.47.3